Home Inspection State Practice Exam 2025 - Free Home Inspection Practice Questions and Study Guide

PEX, or cross-linked polyethylene, is a flexible plastic pipe commonly used in residential plumbing systems for water distribution. Its advantages include resistance to scale and chlorine, lower shipping costs, and less joint fittings, which reduces the chances of leaks. PEX can expand and contract, making it suitable for areas prone to freezing, as it can accommodate changes in water volume without bursting. Additionally, PEX does not corrode like metal pipes, offering longevity and reliability for water distribution.

While CPVC, polybutylene, and PVC also serve various plumbing applications, they each have limitations. CPVC is suitable for hot and cold water but is more rigid than PEX. Polybutylene has been largely phased out due to concerns about its longevity and susceptibility to breakage. PVC is primarily used for drain, waste, and vent systems rather than for potable water distribution, as it is not suitable for high-temperature applications. These factors make PEX a preferred choice for modern residential water distribution systems.